You find a box of old brooches, clip-on earrings, and chunky necklaces in a closet or from a relative’s estate. You’re not sure if it’s all “junk jewelry” or if one of those pieces could help you ...

Take a look inside your jewelry box — or even your junk drawer — and you probably have a few pieces of unidentified rings, bracelets, or necklaces rolling around in there. Sure, they could be costume ...